Spark-plug.



A. SCHMIDT.

SPARK PLUG.

APPLICATION FILED AUG.3l, 1914.

1,192,008. Patented July 1916,

BY WJ/m v A TTORNEY hill BERT 01E FLINT, MIEHIG'A'N, ASSIGNQR .TO CHAMPION IGNITION CGMPA,

@F FLEET, MIIQHEGAN, A CDEPDRATIOII 6F MICHIGAN.

Liddilddh Specification of Letters Patent.

Patented July 25, 1916.

Application filed-August 31, 19.1 Serial No. 859,567.

To all whom it may concern:

Be it known that l, ALBERT SCHMIDT, a citizen of the Republic of France, residing at Flint, in the countyof Genesee and State of Michigan, have invented certain new and useful Improvements in Spark-Plugs, of which the following is a specification, reference being had therein to the accompanying drawings.

The invention relates to spark plugs and resides in the novel construction and arrangement of the electrodes therefor.

In the drawings,Figure 1 is a longitudinal section through the lower end of the spark plug, showing the electrodes in side elevation; and Fig. 2 is a section on the line 02-00 of Fig. 1. p

For obtaininga good spark it is essential that the electrodes upon opposite sides of the spark gap should be either pointed 'or-re-' striated ea moose. On the other hand con-- tinued use will wear away the electrode, and it is quite customary to provide a double spark gap to increase the amount of Wearing surface. With my improved construction I provide electrodes having proper surfaces to produce anefi'icient spark and also provide sul'ficient wearing surface so that it is possible to employ but a single spark gap.

Referring to the one embodiment of the invention shown in the drawings, A is the metallic casing of the spark plug, B is the insulator therein, C is the insulated electrode which passes through the insulator and extends downward therefrom, and D is a grounded electrode secured to the casing A. In the particular construction shown the electrodes 7 and D are provided with portions E and; F that extend substantially par allel to each other for a considerable dis tance, providing a comparatively long spark gap. The length of the spark gap however, may be varied as desired.- The electrodes are formed of round or similar cross-section, and

in order thatthe proper surfacesupon oppo site sides of the spark gap may be had, the

stantially knife edges G. This arrangement makes the surfaces of the electrode sulliciently sharp to produce a good spark.

It will be readily appreciated that my mvention may be embodied in various constructlons and that it is only necessary to shape those portions of the electrodes which are upon opposite sides of the spark gap, though of course, the entire projecting portions of the electrodemight be ground or mil-led if so desired.

l/Vhat I claim asmy invention is':

1. In a spark plug, coiiperating electrodes having portions formed of an approximate wedge shaped section providing longitudinally extended thin edgesopposite and substantially parallel to each other'and in substantially the same plane.

2. In a spark plug, a plug and codperating electrodes each having portions extending obliquely of the longitudinal axis of the plug and opposite and substantially parallel to each other, said portions being of an approximate Wedge shaped cross section pro viding thinedges on opposite sides of the spark plug.

3. In-a spark plug, an insulated electrode having a return bent portion and a portion extending upward obliquely of the longitudinal axis ofcthe spark plug, a co6perating electrode extending downward obliquely of the longitudinal axis of the spark posits and substantially parallel to each other in-the plane of the spark gap.

4. In a spark plug, an'electrode having a portion extending obliquely of the longitudinal axis of the plug, said portion being provided with a thin longitudinally extended edge and acooperating electrode havinga portion provided with a correspond ing thin longitudina ly extending edge substantially in the plane with. said first-mentioned portion, said't hin longitudinally can and parallel to each other.

ALBERT SCHMIDT.

tending edges being substantially opposite r 

